Thread: finding the vertex

I am stuck...please help.

Here is the equation: y=-2x^2+24x-70
find the y intercept
find the x intercept
find the vertex

Originally Posted by getnaphd

I am stuck...please help.

Here is the equation: y=-2x^2+24x-70
find the y intercept
find the x intercept
find the vertex

the x-value for the vertex is given by: $\displaystyle x = \frac {-b}{2a}$

where a is the coefficient of x^2, b is the coefficient of x and c is the constant term. then you plug in whatever value you get for x to find the corresponding y-value, so you can get the coordinate point for the vertex

i suppose you have no problems with finding the intercepts?

for x-intercept, replace y with zero and solve for x

for y-intercept, replace x with zero and solve for y